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Related Concept Videos

Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Related Experiment Video

Updated: Jul 20, 2025

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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Synthesis, Characterisation, and Functionalisation of Charged Two-Dimensional MoS2.

Aleksandra M Krajewska1, Aislan Esmeraldo Paiva1, Michael Morris1

  • 1CRANN/AMBER Nanoscience Institute and School of Chemistry, Trinity College Dublin, The University of Dublin, College Green, Dublin 2, Ireland.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 3, 2023
PubMed
Summary

We activated exfoliated molybdenum disulfide (MoS2) with sodium borohydride (NaBH4) to create an n-doped material. This novel MoS2 is water-dispersible and readily functionalized, expanding its applications.

Keywords:
dispersionsfunctionalisationnanomaterialstransition metal dichalcogenidetwo-dimensional

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Exfoliated 2H-molybdenum disulfide (MoS2) exhibits limited applications due to its inert surface and poor interfacial properties.
  • Developing methods to enhance MoS2's surface reactivity and dispersibility is crucial for broader technological adoption.

Purpose of the Study:

  • To activate the surface of exfoliated 2H-MoS2 using sodium borohydride (NaBH4).
  • To investigate the resulting material's properties, including its electronic characteristics, spectral behavior, and dispersibility.
  • To demonstrate the facile functionalization of the activated MoS2 for new applications.

Main Methods:

  • Surface activation of 2H-MoS2 via reaction with NaBH4.
  • Characterization using zeta potential, photoluminescence spectroscopy, HR-TEM, XPS, pXRD, DRIFT, TGA, and Raman spectroscopy.
  • Assessment of dispersibility in various solvents and functionalization with organo-iodide.

Main Results:

  • The NaBH4 treatment resulted in n-doped MoS2, evidenced by a negative zeta potential (-25 mV) and a photoluminescence red-shift (0.05 eV).
  • The activated MoS2 exhibited excellent dispersibility in water, unlike pristine MoS2, correlating with solvent permittivity.
  • Successful functionalization of the activated MoS2 was achieved through reaction with organo-iodide.

Conclusions:

  • Surface activation of 2H-MoS2 with NaBH4 yields a water-dispersible, n-doped material.
  • This approach enables controlled and facile functionalization of MoS2, overcoming previous limitations.
  • The development opens new avenues for the application of semiconducting MoS2 in aqueous environments and beyond.